Jeff Carver and Victor Basili. 2003.
 Identifying Implicit Process Variables To Support Future Empirical Work. In <em>Proceedings of the 17th Brazilian Symposium on Software Engineering</em>, October 08, 2003, Manaus/AM, Brasil. SBC, Porto Alegre, Brasil, 1-14. DOI: <a href="https://doi.org/10.5753/sbes.2003.23849">https://doi.org/10.5753/sbes.2003.23849</a>.